DocumentCode :
1496282
Title :
Chitosan-Coated Polarization Maintaining Fiber-Based Sagnac Interferometer for Relative Humidity Measurement
Author :
Chen, Li Han ; Chan, Chi Chiu ; Li, Tao ; Shaillender, Mutukumaraswamy ; Neu, Björn ; Balamurali, Papusamy ; Menon, Rahul ; Zu, Peng ; Ang, Xiu Min ; Wong, Wei Chang ; Poh, Chueh Loo ; Leong, Kam Chew
Author_Institution :
Div. of Bioeng., Nanyang Technol. Univ., Singapore, Singapore
Volume :
18
Issue :
5
fYear :
2012
Firstpage :
1597
Lastpage :
1604
Abstract :
A relative humidity fiber sensor based on polarization maintaining (PM) fiber Sagnac interferometery configuration is presented. The proposed sensor is functionalized with a thin layer of a moisture-sensitive natural polymer chitosan, whose degree of swelling varies as a function of relative humidity. The sensing scheme used in this study is based on the strain effect induced on the PM fiber to modulate its birefringence property through the swelling effect of chitosan. To optimize the sensor´s response, the experiments were first conducted to evaluate the effect of chitosan concentration on the PM fiber, followed by investigating effects of chemically etched PM fiber and analyzing modified chitosan sensing film effect on the sensor´s performance. As observed from the results, the optimized sensor exhibits a sensitivity of 81 pm/%RH for the relative humidity ranging from 20% RH to 95% RH with an uncertainty of ±2.04% RH.
Keywords :
Sagnac interferometers; birefringence; fibre optic sensors; humidity measurement; optical fibre polarisation; optical polymers; birefringence property; chemically etched PM fiber; chitosan concentration; chitosan sensing film; natural polymer chitosan; polarization maintaining fiber Sagnac interferometery configuration; relative humidity fiber sensor; relative humidity measurement; strain effect; swelling effect; Biomedical engineering; Humidity; Optical fiber couplers; Optical fiber polarization; Optical fiber sensors; Sagnac interferometers; Chitosan; Sagnac interferometer; humidity fiber sensor; polarization maintaining (PM) fiber;
fLanguage :
English
Journal_Title :
Selected Topics in Quantum Electronics, IEEE Journal of
Publisher :
ieee
ISSN :
1077-260X
Type :
jour
DOI :
10.1109/JSTQE.2012.2194729
Filename :
6184269
Link To Document :
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